CVE-2026-0543: Elastic Kibana

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

Improper Input Validation (CWE-20) in Kibana's Email Connector can allow an attacker to cause an Excessive Allocation (CAPEC-130) through a specially crafted email address parameter. This requires an attacker to have authenticated access with view-level privileges sufficient to execute connector actions. The application attempts to process specially crafted email format, resulting in complete service unavailability for all users until manual restart is performed.

Affected products

• Elastic Kibana: from 7.0.0, up to and including 7.17.29; from 8.0.0, before 8.19.0 (fixed in 8.19.0); from 9.0.0, before 9.1.10 (fixed in 9.1.10); from 9.2.0, before 9.2.4 (fixed in 9.2.4)

Published 2026-01-13. Last modified 2026-06-17.